Detector mechanism for looms



DETECTOR MECHANISM FOR LOOMS Filed Dec. 5. 1924 Ii qi.

witness: mwfirifivy- Patented Mar. 6, 1928.

JONAS nonrrnnor; or 1102111211112, MASSACHUSETTS,- nssrenon, BY mnsnnASSIGN- MENTS, TO DBAPER CORPORATION, OF HOPEDALE, MASSACHUSETTS, AGORPORA- TION 0F MAINE.

DETECTOR MECHANISM FOR LOOKS.

Application filed December 5, 1924. Serial No. 754,064.

The present invention relates to an improvement in detector mechanismslooms. The object of the invention is to reorganize and improve theconstruction of the mechanisms by which weft detectors operate to stopthe-looms or cause weft replenishment in looms, and to this end theinvention consists of the mechanisms hereinafter described andparticularly defined in the claims.

In the accompanying drawing illustrating the preferred form of theinvention Fig. 1 is a plan-of a detector slide, and Fig. 2 is anelevation partially in section.

The illustrated embodiment of the invention is described as follows: Theweft detector or fork is pivotally mounted at 11 on the detector slide12 slidingly supported 7 on the detector slide bracket 13, whichcooperates with a knock-off lever to knock off the loom and also withaweft replenishing mechanism to cause weft replenishment, as illustratedin the Jonas Northrop Patent No. 1,186,988. The slide is provided witha.

misthreading device indicated in a general way by the referencecharacter 14 illustrated in said patent. A. weft hammer 15 carries atits upper end a weft hammer hook 16 pivoted to the weft hammer on thepin 17 and normally held in depressed position by the spring 18 placedon one side of the pin 17, as shownin Fig. 2. The weft hammer hook 16 isprovided with a barb 19 adapted toengage the tail 20 of the fork 10.\Vhen the lay beats forward, the weft, lying across thegrid, strikes thetines of the fork 10 and tips the fork so as to lift the tailof the forkabove the barb; then upon the forward movement of the weft hammer thebarb passes under the tail of the fork, and the hammer moves forwardlywithout imparting movement to the detector slide.

On the forward movementof the weft hammer the fiat under surface 21 oftheweft hammer hook slides upon the plate 22 of the detector slide 12 sothat the hook has a movement forward and backward with respect to thedetector slide, except in the ab sence of yarn in front of the grid, inwhich case the fork is not tilted, and the barbof the hook engages thetail of the fork and pulls upon it to move the detector slide forwardly.Upon the first forward movement for.

of the slide weft replenishment iscalled for in the usual manner. Aftera'number of weftreplenishing attempts, the 100m is knocked off and comesto rest. The weft hammer hook is provided with an overhanging guard orfinger 23 which extends upwardly from the body of the hook and thencerearwardly over the fork. When thread is present in front of the grid onthe lay and the fork is thereby tipped lifting the tail 20 of the fork,it is held tipped until the weft hammer has moved forwardly suflicientlyto move the barb of the hook be yond the cross member of the tail,whereupon the tail engages the tail-supporting surface 24 of the hookwhich extends from the barb to the knuckle 25 of the'finger 23; thenduring the further forwardmovement of the hook the tail of the forkslides on this tail-supporting surface. The under side of the finger '23is so shaped that it engages a portion of the fork and prevents itfromoverthrowing. Thus when the fork strikes the yarn it is tilted withmore or less violence, and that tips the tail up until the body of thetail strikesthe under side of the finger. This prevents overthrow of thefork, and the fork is thereafter prevented from dropping backto itsoriginal position by reason of the tail-supporting surface of the fingerwhich engages the tail. lVhen the weft hammer moves rearwardly, the tailslides down the inclined surface of the hook and drops over the barb atthe extreme end of the rearward movement of the weft hammer. The tailfalls but a short distance, and rebound of the tail does not occur.

The detector fork 10 comprises a body portionconsisting of the main part26 having a hole through which the pivot 11 passes, and the cover 27which consists of a flat piece of metal having a hook 28 at its forwardend which engages the forward end of the part 26 of the body. Two screws29 se cure the cover part to the part 26. The tines 30 of the fork arefour in number and are formed in pairs. The two tines of one pair arejoined by the arcuate top 31 which, as shown in dotted lines in Fig. 2,is received in a depression in the upper part 26 of the body. Thisaffords a secure means for holding the tines in place in, the body, aswell as a construct-ion by which renewal of the tines may be effected.The ends of the tail Q0 of the fork extend along recesses formed in theupper surface .of the body part- 26 and have their ends at right anglesto the length of their bodies and are received in vertical holes in thebody part 26. A. pull exerted upon the tail of the fork is therebytransmitted to the body part 26 and through itto the slide. in a mannerwhich prevents any change in the position of the barb-engaging portionof the tail with respect to the slide. The cover part 27 of the forkbody is provided with slight depressions to receive the arcuate parts ofthe tines and with longitudinal grooves to receive the tail slides. Thebody part of the fork is provided with two depending cars 32 which areprovided to counterbalance the weight of the tines. The body. parts 26and 21' of the fork are made of aluminum. the tines and tail of steelwire. and the screws 2.) of steel.

It will be o served that by providing the weft hammer hook with theoverhanging tingcr excessive movements of the fork are prevented andthat the inclined surface adjacent to the barb contributes to the properaction of the fork under the influence. of the blows to which it issubjected.

Having thus described the invention, what is claimed is:

1. Detector mechanism for looms having, in combination, a detectorslide. a detector fork carried by the slide provided with a tail. and aweft hammer provided with a weft hammer hook and a fork guard extendingrearwardly from the weft hammer hook above the weft fork for engagingthe fork upon excessive upward movementthereof.

2. Detector mechanism for looms having, in coml'iination. a detectorslide. a detector fork carried by the slide provided with a tail. and aweft hammer provided with a weft hammer hook and an overhanging forkguard for engaging the fork upon excessive upward movement thereof, thehook having a barb for engagement with the tail and provided with aninclined tail-supporting surface adjacent to the bar for engaging andsupporting the tail of the fork and easing its descent to a position infront of the barb upon rearward movement of the hook.

3. Detector mechanism for looms havii'ig. in coml'iination. a detectorslide provided with a weft hammer hook support. a detector forkpivotally mounted on the slide provided with a tail. and a. weft hammerprovided with a weft hammer hook. the under side of which is adapted torest and slide upon the hook support of the detector slide. the hookbeing provided with a barb for engagement with the tail of the fork andhaving an overhanging guard extending upwardly and rearwardly from thebody of the hook in the rear of the barb over the body of the tail andadapted upon oscillation of the tail to engage and limit the throw ofthe tail upon its impact with the yarn, said finger having an inclincdtailsnpporting surface exte11 .ling from the barb upwardly andrearwardly and forming the. upper surface of the proximal end of theguard.

at. Detector mechanism for looms having. in combination. a detectorslidc. detector fork carried by the slide provided with tines and atail. and a weft hammer provided with a. weft hammer hook having anoverhanging fork guard extending rcarwardly over the body of the forkand adapted to engage the latter upon overthrow of the fork. said hookbeing also provided with a barb for engagement with the tail uponfailure of weft indication.

5. Detector mechanism for looms having. in combination. a detectorslide, a detector fork carried by the slide provided with a tail. :1weft hammer provided with a weft hannner hook for engaging the tail ofthe fork, and a spring connection between the weft hammer and the wefthammer hook acting to hold the hook in depressed position.

6. Detector mechanism for looms having. in combination. a detector slideprovided .with a hook supporting plate. a detector fork carried by theslide provided with a tail. a weft hammer. weft hammer hook. PlYOftlllymounted on the weft hammer and resting on the hook supporting plate ofthe slidc. and a sprin; connection between the weft hammer and the weft.hammer hook acting to hold the hook against the support.- ing plate soas normally to maintain it in correct operative position with relationto the fork tail.

7. Detector mechanisn'i for looms having. in combination. a detectorslide provided with a weft hammer hook support. a detector fork carriedby the slide provided with a tail. :1. weft hannner. a weft hammer hookpivotally mounted on the weft hammer and having a portion rcr' tiug onand supported by the hook snpport.tl1c weft hammer hook being providedwith a spring carvying portion above the pivot. and a spring in saidspring carrying portion of the hook taking against a portion of the wefthammer. tending to turn the hook in a direction to hold it down on thehook support.

In testimony whereof l have signed name to this specification.

JONAS XORTIIROI.

ltlti lit)

